Disclosed are pyrazolyl pyrimidinamine compounds with structures as shown in Formula I: The definitions of each of the substituents can be seen in the description. The compounds of present invention have a broad spectrum of bactericidal, insecticidal and acaricidal activity, and have good control effect on downy mildew of cucumber, powdery mildew of wheat, corn rust, anthracnosis of cucumber and the like, and especially have better control effect on downy mildew of cucumber, powdery mildew of wheat and anthracnosis of cucumber. The compounds of present invention also show good insecticidal activity, part of the compounds, at very low doses, have excellent control effect on diseases caused by Plutella xylostella, armyworm, Myzus persicae, Tetranychus cinnabarinus etc.