Boron composition particles coated with LiF,Al,Ammonium perchlorate(AP) respectively were prepared by methods of solvent-nonsolvent,solvent evaporation,extraction, and experimental propellants with these particles were also made. IR，SEM were used to characterize their structure and forms,and DTA and TG were used to study the thermal behaivors. Results indicate that coating makes water on boron composition surface decrease and the thermal characteristic of boron composite and the propellant improve. Compared to pure boron/AP mixture,the apparent decomposition heat and loss of weight of AP/nano Al composite mixture increases from -19.7 J·g^-1 to 1799.1 J·g^-1 and from 52% to 69.02%,respectively. In comparison with propellant with pure boron powder,the apparent decomposition heat of propellant with boron composition increases 12.6%.