The invention discloses a distribution network capacitor configuration method based on genetic algorithm guiding Trust-Tech. The distribution network capacitor configuration method includes the steps of taking the minimum total cost during the operation of a distribution network capacitor as an objective function, and establishing a constrained non-linear optimization model for capacitor configuration; constructing flow equations, node voltage, circuit thermal limit and constraints under which the maximum/minimum number of capacitors can be installed; representing each individual in a group with a binary character string, using a genetic algorithm for determining an initial optimal solution in a random search manner, and reducing the number of optimization layers; and using the Trust-Tech for finding out a local optimal solution of each region by searching layer by layer until search conditions are met. The invention overcomes the difficult problems that optimization problems are highly nonlinear, control variables are mixed integers, a global optimal solution is hard to obtain by using a conventional method and the calculated amount results are random while solving the capacitor configuration problem in the distribution network.