Abstract: The main influencing factors of the stability of the arch rib of long-span arch bridge in constructing process are the connector rigidity of rib sectors,the fixing deviation,wind load,etc.Beginning from the bending resistance rigidity of the connector and in connection with three connector models,we can analyze the influence of stable factors on the stability of different connector models and compute the stability coefficients of arch rib in constructing process.The computation results show that the minimum value of the stability coefficients is slightly less than the limit value in Road Criterion,so the controlling measures should be taken