Aluminum-rich chondrules are one of the most interesting components of primitive chondrites, because they have characteristics in petrography and mineralogy that are similar to both Ca- and Al-rich inclusions (CAIs) and ferromagnesian chondrules. However, their precursor and formation history remain poorly constrained, especially with respect to their oxygen isotopic distributions. In this study, we report on the petrography, mineral chemistry, and oxygen isotope ratios of two Al-rich chondrules (K1-CH1 and K2-CH2) in the Kainsaz (CO3) carbonaceous chondrites. The major phases in Kl-CH1 are plagioclase, olivine and Ca-poor pyroxene, and those in K2-CH2 are plagioclase and olivine. All minerals in two Al-rich chondrules are O-16-poor. The Delta O-17 values in K1-CH1 vary in two ranges of from -11. 1 parts per thousand to -8. 7 parts per thousand and from -3. 9%o to 0. 4 parts per thousand, while those in K2-CH2 vary from -6. 6%o to -0. 6%o with a tendency increasing from the core to rim. These observations provide a strong indication that the two Al-rich chondrules formed by the melting and crystallization of a mixture of materials from CAIs and ferromagnesian chondrules. The precursor materials of K1-CH1 and K2-CH2 are CAIs + olivine-pyroxene-rich chondrules and CAIs + olivine-rich chondrules, respectively. The O-16-poor isotopic compositions of all components in two Al-rich chondrules can be explained by oxygen isotopic exchange between the melt and O-16-poor nebular gas (Delta O-17: - 8. 7 parts per thousand - 7. 8 parts per thousand) during melting in chondrule-forming regions; whereas the minerals in two chondrules could have experienced further oxygen isotopic exchange with a relatively O-16-poor reservoir (Delta O-17: -0. 6 parts per thousand similar to 0.4 parts per thousand) on the parent body, likely during fluid-assisted thermal metamorphism.