Realizing method for on-screen aid

This invention relates to a realization method for on-screen help including the following steps: 1, starting up an on-screen help program, 2, generating an order character string describing the traversal relation of the control after the primary program of the applied software obtains the focus matter information for controlling the obtained focus to enter into the activation state on the applied software interface, 3, said on-screen help program conmmunacates with said primary program to get the order character string, 4, said on-screen program inquires the index table of the file of the on-screen help to get its path information corresponding to the character string, 5, outputting and displaying the on-screen help file corresponding to the string.