The traditional method of both analysis and design has a large number of simplifications and experience.

The traditional structural design method is based on experience and judgment of the designers to put forward the design scheme, and then use mechanical theory to analyze and check the given scheme. If the program does not meet the constraints, the design variables are manually adjusted, and the analysis and verification are repeated until a feasible program is found, i.e., a program that meets the constraints of various conditions. This design process has a long cycle, high cost, low efficiency, and the result is only a feasible program, most of which is not the optimal design. The traditional method of both analysis and design there are a lot of simplification and experience, poor accuracy.