Aiming at problem that stability of the later stage using traditional virtual force algorithm is poor

which prone to leads to decrease of coverage rate

a variable step-size virtual force algorithm based on sigmoid function is proposed.By reducing error of each iteration

adjust step-size of each moving of node

that is

speed of node moving

to improve convergence speed and stability of later stage. Use 0—1 disk node sensing model

the proposed variable step-size virtual force algorithm is simulated in rectangular monitoring region of 800 m × 700 m. The simulation results show that the proposed algorithm ensures convergence speed

increases the average coverage rate by 4.23 % and the optimal value of coverage rate by 1.52 %

compared with the traditional virtual force algorithm.Besides

the stability of the later stage compared with the traditional virtual force algorithm is improved by 95.05 %.