diff --git a/persona-brain-db/schema/09-system-language-membrane.sql b/persona-brain-db/schema/09-system-language-membrane.sql
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+-- ============================================================
+-- 表9：system_language_membrane（Layer 1 · 语言膜架构表）
+-- 用途：存储HLDP语言结构的各层定义
+-- 五层：元语言层、语义层、语法层、语用层、情感层
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS system_language_membrane (
+  membrane_id       VARCHAR(32)   PRIMARY KEY,
+  layer             VARCHAR(32)   NOT NULL
+                    CHECK (layer IN ('meta', 'semantic', 'syntax', 'pragmatic', 'emotional')),
+  name              VARCHAR(128)  NOT NULL,
+  description       TEXT          NOT NULL,
+  rules             TEXT,                         -- JSON object of rules for this layer
+  version           VARCHAR(16)   NOT NULL,
+  status            VARCHAR(16)   NOT NULL DEFAULT 'active'
+                    CHECK (status IN ('active', 'deprecated')),
+  created_at        TIMESTAMP     NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_slm_layer ON system_language_membrane(layer);
+CREATE INDEX IF NOT EXISTS idx_slm_version ON system_language_membrane(version);