Government Procurement Case of Dongfeng's New Sewage Treatment Vehicle in Xiamen: Scoring-Based Bid Winning Strategy Analysis. In this coastal city, the humid and hot climate and frequent rainy seasons impose stringent requirements on sanitation vehicles. In 2026, a municipal sanitation department launched an open tender for Dongfeng's new sewage treatment vehicles, with a budget capped at approximately RMB 1.355 million, planning to procure three 15-cubic-meter sewage treatment vehicles. Chengli Special Purpose Vehicle Co., Ltd. successfully delivered these vehicles by leveraging its CLW5180GSSD6 model (officially certified) and a tailored technical solution. This article analyzes the case through a 'scoring-deconstruction' framework—breaking down the tender evaluation criteria into technical, commercial, and service scoring strategies—to provide procurement entities with authentic, actionable insights. I. Tender Evaluation Criteria Breakdown According to publicly available tender information, this procurement employed a comprehensive evaluation method with a total score of 100 points, allocated as follows: Technical Score (40 points), Commercial Score (30 points), Service Score (20 points), and Price Score (10 points). Given Xiamen’s location along China’s southeastern coast, its humid and hot environment imposes exceptionally high demands on vehicle corrosion resistance and durability; thus, a dedicated sub-category—'Environmental Adaptability'—was included under the Technical Score, accounting for 12 points. Chengli’s team proactively developed a targeted solution addressing this challenge. 1.1 Technical Score (40 points) Subdivided into: Chassis & Superstructure Performance (15 points), Environmental Adaptability (12 points), Regulatory Compliance (8 points), and Energy Conservation & Emission Reduction (5 points). 1.2 Commercial Score (30 points) Focused on: Corporate Qualifications & Track Record (10 points), Experience with Similar Projects (10 points), Quotation Strategy & Transparency (10 points). 1.3 Service Score (20 points) Includes: After-sales Response Time (8 points), Spare Parts Availability (6 points), Training & Technical Support (6 points). II. Maximizing the Technical Score: Robust Design for Humid-Hot Environments Prior to bidding, Chengli’s team conducted in-depth research on Xiamen’s climatic characteristics: annual precipitation ~1,200 mm, average relative humidity >75%, and summer temperatures reaching up to 35°C—conditions highly conducive to vehicle corrosion and sealant aging. Accordingly, the technical proposal centered on three core aspects: anti-corrosion coating systems, sealant durability under humid-hot conditions, and high-load performance during prolonged rainy-season operations. 2.1 Anti-Corrosion Coating: Full-Body Electrophoretic Coating + Multi-Layer Spray Painting For both chassis and superstructure, Chengli applied full-body electrophoretic coating, supplemented by three layers of epoxy primer and polyurethane topcoat. Per the official CLW5180GSSD6 model specifications, the standard anti-corrosion rating already meets 500-hour salt-spray testing; the customized version for Xiamen was upgraded to 800 hours. Client feedback states: “After one year of operation near Xiamen Port, no rusting was observed on the vehicle frame.” 2.2 Sealant Durability: Silicone Material + Accelerated Aging Testing As sewage treatment vehicles involve liquid conveyance, sealants are critical components. Chengli selected imported silicone sealing rings and performed 1,000-hour accelerated aging tests in laboratories simulating Xiamen’s humid-hot environment. Test results confirmed no cracking occurred under conditions of 90% relative humidity and 40°C. In actual use at an industrial park in Xiamen, the vehicle operated continuously throughout a 30-day rainy season without leakage. 2.3 High-Load