It was conducted with Sanyuehong litchi fruits to study the effects of K and Ca and Mg applied in foliar nutrients on the synchronism of pericarps coloring and flesh flavours changing.The treatments included spraying the concentrations 0.5% of KCl(K),0.3% of CaCl2(Ca)and 1.5% of MgCl2(Mg)solutions and their mixtures,and the check(CK)was sprayed with clean water.The results showed that generally,with the growth and development of fruits,the values of h and the total acid in flesh decreased,the contents of sugar and the ratio of sugar/acid in flesh increased.The dynamic changes of the ratio of sugar/acid in flesh showed significant difference at the later stage among different treatments.From April 27th to April 30th,the ratio of sugar/acid in flesh of the treatments Ca and Mg showed no significant difference,while those of the other treatments and CK were significantly decreased,and the ratio of sugar/acid in flesh of the treatment Ca was significantly higher than that of CK.The dynamic changes of the different treatments on the values of h in pericarp also showed significant difference at the later stage.The value of h in pericarp of the treatment Ca+Mg dropped to the bottom and was significantly lower than those of CK and the other treatments on April 27th,and then showed no significant difference till April 30th,while those of the other treatments and CK were significantly decreased.And the value of h in pericarp of the treatment Ca was significantly higher than those of the other treatments and CK on April 27th.So the synchronization of the values of h in pericarp and the ratio of sugar/acid in flesh of the treatments Ca+Mg and Ca achieved the best on April 27th and 30th respectively.The treatment Ca+Mg solved the problem that the peel kept green when the ratio of sugar/acid in flesh rising to the top,and the treatments Ca and Mg solved the problem that the ratio of sugar/acid in flesh dropped when the pericarp coloring full,and the treatments Ca+Mg and Ca improved the pericarp coloring and the fleshs flavour together.