Due to the low redundancy of the traditional beam string structure, it is easy to cause a continuous collapse of a structure when the lower string pre stay cable is broken by accident. A new type of beam string structure is proposed by improving the traditional tensioned beam spars, lower chords and the connection forms among members. Based on ANSYS/LS-DYNA program platform, Some new beam string structure models with different spars crossover angles and spars numbers are analyzed for continuous collapse resistance by using the instantaneous unloading method of the equivalent load in the initial state. The analysis results show that the new beam string structure will not collapse continuously when any section of the lower chord fails, but the lower spar internal force will increase suddenly, and also show that the closer the brace cross node is to the bottom chord, the more cross brace groups, the better the progressive collapse resistance of the new beam string structure.