This paper first introduces the basic concept,classification and application of trajectory prediction studies its developments in advanced aviation countries,and explains why it is necessary to develop our own trajectory prediction system.

The result shows that the trajectory prediction based on the cubic spline has high accuracy and practical engineering value.

This paper considers various probable error of course prediction and corrects the error convariance matrix of course prediction after altering the trajectory position.

Aiming at the shortcoming of the conventional flight plan management,based on the algorithm of MK-NN Track association,a method is presented to associate integrated track and plan track,which adopt Off-Course-Factor(OCF),Time-Lag-Factor(TLF),Direction-Factor(DF),Velocity-Factor(VF),and Area-Factor(AF).

This paper aims at the difficulty of calculating the exact flight plan track and the shortcoming of the conventional flight plan association,adopts flight plan,take-off-report,position report to calculate the exact plan track,according to the characteristic of association,uses the algorithm of fuzzy synthetical function track association,establishes the simulation,solves the problem.