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Electrical transport and Iow-field magnetoresistance (MR) are reported for (1 - x)LCMO/xYSZ composites(0 ＜ x ＜ 80%) (LCMO is La2/3Ca1/3MnO3 and YSZ is yttria-stabilized zirconia). Different transport and MR behaviours are observed for x ＜ 2% and x ＞ 2%. In particular, the composite with x ≤ 1% shows a wide temperature window with a large constant MR below the transition. Based on microscopy analysis, a possible interpretation is presented for different observations for x ＜ 2% and x ＞ 2% with emphasis on the boundary effect arising from insulating YSZ layers.