By researching the site selecting of underground salt cavity in natural gas storage service both domestically and abroad this paper confirms a series of site selective preference principles of underground salt cavity natural gas storage.

Aiming at the expense constitution in warehouse location, the paper establishes a mathematical model for warehouse location in the process of dynamic decision-making in order to select the location by stages.

Based on the factors of mass economy,the paper establishes a multi-warehouse location model which takes the sum of minimized supply costs,transport costs and fixed costs as the goal and within which supply costs are expressed by piecewise linear cost function,solves the model with a genetic algorithm and shows an example.

To help the 3PL companies make the right decision on the warehouse location,on the basis of the lowest-cost company object and former data and experience,this paper utilizes WSMP,GA and AHP to solve the warehouse location problem.

An Inventory-Location Model With the Economies of Scale for Transportation;

Then an optimal location model for uncontrolled crosswalk sitting was established on the basis of the minimal total expenses,the enumeration method and inherit algorithm were used to optimize the location,and example verification was given.