Objective: To do a comparative study of compressed pieces and traditional pieces of Lonicera japonica. Method: Appearance and TLC identification had been used to compare compressed pieces and traditional pieces of L. japonica.With the content of chlorogenic acid and dry extract rate as indexes to compare decoction quality between compressed pieces and traditional pieces of L. japonica in honeysuckle decoction and Yinqiao powders.Then dissolution curve of chlorogenic acid between compressed pieces and traditional pieces of L. japonica was compared

and f2similarity factor evaluation was adopted. Result: Appearance of compressed pieces was good

TLC identification of compressed pieces and traditional pieces of L. japonica was distinct and highly specific.The content of chlorogenic acid and dry extract rate in compressed pieces were a little higher than traditional pieces in honeysuckle decoction and Yinqiao powders.Dissolution behavior was similar between compressed pieces and traditional pieces through contrast of f2 similarity factor. Conclusion: Quality of L. japonica did not change after compressed

which didn't affect dissolution of chlorgenic acid

and could ensure boiling quality of decoction.