1. A system for implementing a sliding input of a text based upon an on-screen soft keyboard on an electronic equipment, characterized in that, said system comprises: a memory device configured to store ideal sliding trajectory features for words; and a processor coupled to the memory device, the processor being configured to: record user-sliding trajectories and convert the recorded user-sliding trajectories into a user-sliding trajectory feature set; filter in the memory device and originally choose the words, wherein each of the originally chosen words has similar ideal sliding trajectory features with the user-sliding trajectory feature set; calculate a similarity between the ideal sliding trajectory features of each originally chosen word and said user-sliding trajectory features set according to key points on said trajectory, comprising the steps of: calculating a rough similarity between the ideal sliding trajectory features of each originally chosen word and said user-sliding trajectory features set, wherein said step of calculating the rough similarity comprises calculating a linear matching distance between the ideal trajectory of each originally chosen word and said user-sliding trajectory feature set; and calculating an accurate similarity between the ideal sliding trajectory features of each word obtained from the rough similarity calculation result and said user-sliding trajectory features set; obtain candidate words according to the similarity, wherein the ideal sliding trajectory of each candidate word contains at least one of the key points or at least one of the surrounding points of at least one of the key points on said user-sliding trajectory; and display said candidate words.