Abstract: The Least Squares Optimization Model with constraints is used to study the bidding problem of two adjacent batches of goods with dynamic float ratio under non-cooperative mode,where the average price of each type of goods and the optimal bidding of each batch are adopted.The model is applied in a real bidding invitation of national grid capacitor project.The results show that the bidding model presents satisfactory performance and has good viability.Some suggestion on the formula of benchmark price B =A_l×(1-a)is given in the end.

Key words: Benchmark, Optimal bidding, Least squares, Float ratio