For　environmentally　benign　lead-free　ferroelectric　ceramics,　the　trait　of　temperature-dependent　phase　boundary　renders　ceramics　with　intrinsic　temperature　sensitivity,　obstructing　them　toward　practical　applications.　Recently,　laminated　composite　ceramics　were　widely　implemented　to　solve　temperature　instability.　However,　such　2-2　type　structure　exhibits　inherent　limitations　on　properties　promotion.　Given　this,　the　present　work　proposes　a　novel　strategy　of　3-3-like　heterostructure　engineering　to　tackle　the　problem.　Compared　to　the　laminated　counterpart,　3-3-like　ceramic　shows　boosted　dielectric,　ferroelectric　and　strain　properties.　Significantly,　its　electrocaloric　(EC)　operating　range　is　expanded　from　18　to　49　°C,　two-fold　wider　than　the　laminated　one,　while　a　large　EC　temperature　change　of　0.66　K@30　kV/cm　is　maintained,　which　shows　great　property　advantages　to　that　of　state-of-art　lead-free　ceramics.　The　superior　performance　benefits　from　the　relatively　uniform　field　dispersion　of　3-3-like　heterogeneity.　As　a　contrast,　sharp　interface　divergence　causes　abnormal　field　distribution　and　phase　destabilization　in　laminated　structure,　which　undermines　the　electrical　properties　and　limits　temperature　stability.　This　work　offers　a　favorable　strategy　for　designing　high-performance　lead-free　materials　with　desirable　temperature　reliability.　©　2024