The magnetic hysteresis and relaxation behaviors in ＹＢａ2Ｃｕ3Ｏ7-δ and Ｙ0.9Ｅｕ0.1Ｂａ2Ｃｕ3Ｏ7-δ samples were measured in the wide ranges of temperature (4.2-80K) and field (0-8 T). The M(t), Jc(T) and Ueff(J) relationships in these samples were studied and several theoretical models were tested. The results show:(1)Both the effective pinning energy and critical current density in the absence of flux creep are obviously higher in Ｙ0.9Ｅｕ0.1Ｂａ2Ｃｕ3Ｏ7-δ than in ＹＢａ2Ｃｕ3Ｏ7-δ sample, which indicates the introductions of new pinning centers with larger pinning energy by the partial substitution of Eu for Y. (2) Compared with other models, the collective flux creep theory gives the best description on our experimental results and thus this work provides a new experimental evidence for this theory.