Abstract:Some natural product containing natural active components such as grapes，yellow lemons，green lemons，pomegranates，pineapples and papayas were extracted by direct juicing method，and the nitrite removal experiments were carried out in vitro with the obtained extracts at different mass fractions.Three kinds of fruits，yellow lemon，pineapple and papaya，which had the best eliminating effect，were screened out and mixed in different proportions，and the optimum compound ratio was determined according to the clearance rate.Three kinds of fruits selected from the above experiments，yellow lemon，pineapple and papaya，were used to block the synthesis of nitrosamine in vitro，and the compound was mixed in different proportions to determine the best compound ratio according to the blocking rate.The results showed that the mixture of 1.0%yellow lemon juice，1.0%pineapple juice and 0.8%papaya juice had the best nitrite scavenging effect，and the scavenging rate was 79.5%.When 12%yellow lemon juice，8%pineapple juice and 10%papaya juice were mixed，the blocking effect of nitrosamine was the best.The blocking rate was 51.1%，which had an ideal blocking effect on nitrosamine.